I've been carrying a pocket knife of some kind every day since I was 10 or 12 years old; I'm 55 now. I can tell you from decades of experience that a pocket knife has hundreds of more uses than the 36 "manly" and boring ones listed. Art of Manliness indeed.
I am a believer that everyone should carry a pocket knife of some kind. For years I carried a "basic" cheap pocket knife (yes, grade school and high school), then I carried a Buck lockback knife, and then for a couple of decades I had folding utility knives (I worked retail and then managed a warehouse). These days I am loving my Opinel No.8 carbon.
Everyone should keep a pocket knife of some kind.